<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>测试页面</title>
<style>
  #one{
    width: 200px;
    height: 200px;
    background-color: rosybrown;
    margin-top: 10px;
    overflow: auto;
  }


  #two{
    width: 50px;
    height: 50px;
    background-color: #66b1ff;
    margin-top: 100px;
  }
</style>
</head>
<body>

<div id="one">

  <div  id="two"></div>
</div>





</body>
</html>
